Rebuilding the TXC2Air [paid link] rear shock from Öhlins at home is an excellent way to save money and gain a deeper understanding of your bike’s suspension. Whether you are looking to perform routine maintenance or fix a specific issue, this guide will walk you through the process. By following each step carefully, you can restore your TXC2Air [paid link] rear shock to optimal performance.
Tools Required
To rebuild your TXC2Air rear shock, you will need the following tools:
- 8mm and 10mm socket wrenches
- Torque wrench [paid link] (0-40 Nm)
- Snap ring pliers
- Shock pump
- Oil bath (for cleaning parts)
- Clean cloths or rags
- Shock-specific rebuild kit (O-rings, seals, and oils)
- Seal driver
- Small flathead screwdriver
- 2.5mm Allen wrench [paid link]
- Teflon tape
- Air canister removal tool
Step 1: Remove the Rear Shock from the Bike
Before beginning the rebuild process, you must first remove the TXC2Air rear shock from your bike.
- Use the appropriate Allen wrenches [paid link] to remove the bolts securing the shock to the frame and linkage.
- Once detached, carefully remove the shock from the bike, taking care to keep track of any washers or bushings used in the mounting.
Step 2: Disassemble the Shock
Once the shock is off the bike, it’s time to start the disassembly.
- Release the air pressure: Use the shock pump to gradually release all air from the shock.
- Remove the air canister: Using an air canister removal tool, gently twist and remove the canister from the shock body. Be cautious of the internal components when removing the air canister.
- Take apart the damper: Use the snap ring pliers to remove the snap rings securing the damper to the shock body. Then, pull the damper unit free from the shock body. Pay close attention to the order of the components, as you’ll need to reinstall them in the same order.
Step 3: Clean the Internal Components
Once you’ve disassembled the shock, thoroughly clean all internal components.
- Clean the damper: Wipe down the damper shaft and piston. Use a clean rag soaked in shock oil to clean the parts. If there is any heavy buildup, use the oil bath to soak the parts and scrub them gently.
- Inspect the seals and O-rings: Check for any damage or excessive wear. If the seals or O-rings are worn, replace them with fresh ones from the rebuild kit.
- Clean the shock body: Use a rag or cloth to wipe the inside of the shock body. Ensure no dirt or debris remains that could interfere with the function of the seals.
Step 4: Inspect and Replace Worn Parts
Now is the time to inspect the shock for any damaged or worn components.
- Check the piston and shaft: Look for any bends, cracks, or significant wear. Replace any damaged components to ensure smooth shock action.
- Examine the seals: If the seals are worn or hard, they could cause leakage, reducing the performance of the shock. Use the rebuild kit to replace these components.
- Inspect the air canister and shock body: Look for any signs of cracks, dents, or other damage. If the shock body or air canister is damaged beyond repair, it might need replacing.
Step 5: Reassemble the Shock
After cleaning and inspecting the parts, it’s time to start reassembling the shock.
- Lubricate the seals: Lightly lubricate the new seals with fresh shock oil to ensure smooth operation during reassembly.
- Install the damper: Slide the damper back into the shock body, securing it with the snap rings. Ensure everything fits securely and that the damper moves freely.
- Install the air canister: Align the air canister with the shock body and gently twist it back into place. Make sure the canister is seated fully to avoid air leakage.
- Check the O-rings: Ensure the new O-rings are correctly seated in their respective grooves before sealing the shock.
Step 6: Charge the Shock with Air
Once the shock is fully reassembled, it’s time to charge it with air.
- Install the air valve: Attach the shock pump to the air valve on the air canister.
- Pump to the desired pressure: Inflate the shock to the recommended air pressure. This pressure varies depending on rider weight and riding style, so check the Öhlins manual for guidance. Typically, this will be between 150-250 PSI.
- Check for leaks: After the shock is charged, inspect the air canister and shock body for any air leaks. If there are leaks, you may need to disassemble the shock again and inspect the seals.
Step 7: Test the Shock
Before reinstalling the shock on your bike, test it to ensure it is functioning correctly.
- Push and compress the shock: Gently push on the shock to ensure it compresses and rebounds smoothly. If you notice any irregularities, such as sticking or harshness, recheck your rebuild process.
- Test under load: Compress the shock with your weight to simulate riding conditions. If the shock feels consistent and smooth, it is ready for reinstallation.
Step 8: Reinstall the Shock
After confirming the shock works properly, you can reinstall it on your bike.
- Align the shock: Carefully position the shock back onto the frame and linkage, ensuring the mounting holes align correctly.
- Secure the bolts: Use a torque wrench [paid link] to tighten the bolts to the manufacturer’s specified torque settings. Over-tightening or under-tightening can lead to damage or improper performance.
- Check the mounting hardware: Ensure all washers and bushings are properly seated, and there is no movement in the shock.
Troubleshooting Common Issues
Air Leaks
If the shock is losing air after rebuild, inspect the seals and O-rings. Ensure that the air canister is correctly seated and that no seals are damaged. Replacing worn seals and lubricating them properly can resolve air leaks.
Harsh or Inconsistent Rebound
If the rebound feels harsh or inconsistent, check for air bubbles in the oil or incorrect oil levels. Ensure the damper and rebound adjustments are functioning correctly. A thorough oil change may be necessary.
No Rebound Adjustment
If the rebound is not adjustable, check the rebound adjuster for any obstructions or damage. If the rebound knob is not turning smoothly, it may need replacement.
Customization and Optimization
Adjusting the Rebound and Compression
Once the shock is rebuilt, you can fine-tune the rebound and compression settings to match your riding style. For smoother rides, you might want a slower rebound, whereas faster, more aggressive riders may prefer a faster rebound setting. Compression adjustments can be made depending on the terrain; harder compression settings are better for downhill riding, while softer settings are ideal for cross-country.
Oil Choice and Viscosity
To further optimize the shock, you may choose a different type or viscosity of oil based on your riding needs. Higher viscosity oil provides better damping control for rougher terrain, while lower viscosity oil can improve small bump sensitivity for smoother trails.
Compatibility with Other Drivetrain Components
The TXC2Air rear shock is compatible with a variety of modern mountain bike drivetrains. Ensure that your shock is installed correctly with the rest of your suspension components to avoid any interference with the drivetrain, especially when adjusting sag and travel. Additionally, ensure the shock’s mounting hardware matches the frame and linkage specifications for proper fitment.
By maintaining and rebuilding your TXC2Air rear shock regularly, you can ensure a smooth, high-performance ride for many miles.